When I was a kid, my parents had their own language. No, that's not my weird belief yet - be patient.
It was just spelling aloud, but using a short word for each consonant. B becomes "Bub", C becomes "Cut", H becomes "Hash", etc. Also, to double a letter, precede it with "Square". Hence the word "butter" would be rendered as "Bub U Square Tut E Rud." With a little practice you can learn to speak and understand it very quickly. My parents used it constantly to talk in front of the kids without us knowing what they were saying.
When I was eight, I broke the code (not transliterating the vowels finally gave me the clue that they were just spelling. After that it was simple.) I was smart enough to solve the code, but too stupid to keep my mouth shut. I promptly told everyone how clever I was. If I'd really been clever I'd have eavesdropped on them for years.
A childhood belief about speaking

others believed things like this
- Huey Lewis's "Hip to be square" - in 3rd grade I could have SWORN it was "hit the beef square". ????Anon
- My parents used to tell me watching television turns your eyes square.— Ruth
- I used to be told that if you watched too much TV your eyes would turn square. — Amy
- I used to believe that if i watched TV for too long, my eyes would turn square. As told to me by my mother.— Alex
- I used to believe that switching the light on and off was morse code to burglarsAnon
- i used to believe that i really would end up with square eyes if i watched too much tvAnon